Heat-control switch



Dec. 14 192s. 1,610,509

F. F. FORSHEE HEAT'CONTROL SWITCH Filed March 24, 1921 1 f i i NW 4 WITNESSES:

I J I BY 4 2 Y ATTORNEY Patented Dec. 14, 1926.

' UNITED STATES FRANK F. FORSHEE, OF FLINT, MICHIGAN, ASSIGNOB, BY MESNE ASSIGNMENTS, TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, EAST PITTSBURGH, PENNIEIE'LVANIA, A. CORPORATION OF PENNSYLVANIA.

HEAT-GUIITRQL SWITGH.

Ayplieatioe. mes March 2 1, 1921.

My invenelon relates to quick-break switches one perilcuieriy to eleeti'omegnetloeiiv opei'e'teo switches and; it ha $01 one of its objects to provide e switch which sbeii 5 have but one actuating coii.

Another of .ies objects is to provide e switch "which sbaii have but e singie mov ebie actuating coil for closing end "for iIiiEl revolting circ com-roiled bytbe w .einoihei" object is to provide energysieving moses which sheii store eneifgy aim the f" gees-12', oz-E "the movemeoe oi the Wviicb which storeci energy sbeii soot-inns and complete the eeiei coil end its associated moving parts Wish- L101} oi the svnien.

w is oi known to the but, in o sietioeery coils see i with the movebie co'ee essocieieci Wiii'l svviec'i e .Lm LG open me, to eioseci permit 6.. e mi guide membelm svvi' cb membee which ispi'w termediete iiis length end .I pi'ovide an eoeegvstomeg means form e spring which also 'aoconnect the movable magnet coii "he oiede member. 'ssoai sizitio'nery et ierminels else provicied 41o 60-1DTilie mile the movabie coniocl oi blade portion of the switch member, the Soimensions of be biecie portion enci the loos tion of the switch jaws being" such that the megeei coii will move over a substanitiei pert its path of travel before the electric circuit through the magnetcoii is inier mpieel.

lie the singie sheet of drawings,

Figure 1 is a view, in iront elevation of e device embodying my invention together e schematic representation of a control thermostat, e resistor enoi on electric suppiy circuit and 2 is e vie-e iii side eieveiioo, oi the device embody 1g invention A base pilots oisuiicebie iiiseie'vbi'og me" eerie subsis; Emily 5 were combo i e pi eiiey o1: soppoeueg oreckeos 2 61 eileleml which suitsbiy secured. p "e by screws o3? bolts 3, The supporting brackets 2 see mode oi? eeiebiveiy ff mete? one ere oi iii-she beigi eo-opemos v' so. eioogeieci composite The 1 embers A located to ovide um "The 1? sui'oebi secured to A by sereiveo outside of t" i by scievv i A beass bushing is is ioceied side ozi the magnet coii 8 ezoci is beioi in proper om ereztive posieion reietiveiy thereto by meeiie oi ivvo memi coiiers 15., The bushing 142 is hollow and the internal diameter thereof is such as to permit of its being located on the guioie membei i end be movable thereon.

A portion of each of the end members 10 is cut away, as indicated'et 16 in Fig, 2., to

provide a substantial clearance space between it and the corresponding coller memher 15. One end of the winding 9 is connected to one of the end members 10 and the other endis connected either to one of. the

coil and each arm has a slot '21 therein.

-- The upper end of each arm is bent substantially at right angles as indicated at 22. A

bolt or screw 23 is suitably secured to each .of the members 12 substantially at the middle of the magnet coil 8 to engage the slot 21 and move freely therein.

An energy-storing device, consisting of a spring 2 1, provides a flexible resilient connection between the members 22 and 23.

Two stationary terminals 25 are mounted on the base plate 1, each of which is provided with suitable jaws 26 of substantially double- U-shape.

.A bar 27 provides an electric connection between the stud 20 and a terminal 28, lo-

cated at the bottom of the base 1.

A heating element 29 is schematically indicated as being controlled by the switch, and a thermostat 30 is provided to suitably 1 control the actuation of the magnetcoil 8.

The thermostat 30 cooperates with suitable stationary contact terminals 31 and 32, the contact terminal 32 being the one which is .engaged by the thermostat when the temperature is below a predetermined value and the terminal 31 being engaged by it when the temperature reaches or exceeds a pre determined value.

One of the terminals of the resistor 29 is connected-to one of the conductors of a supply circuit 33 and also to contact terminal 31 and its other terminal is connected to contact 28. The stationary end of the member 30 is electrically connected to one of the supporting brackets 2. The contact terminal 32 is connected to the other conductor of the supply circuit 33, the other conductor of such circuit being connected to one of the terminals 25. The other terminal 25 is connected to the other-conductor of the sup.- ply circuit 33, the terminal 31 and one of the terminals of the resistor 29.

If it is assumed that the positions of the magnet coil 8 and'th'e switch member 17 are substantially as indicated by the full lines in Fig. 1, the resistor 29 is being energized by the supply circuit 33.

If the temperature reaches .a predetermined value, the thermostat member 30 engages the stationary contact terminal 31 as indicated in Fig. 1 and completes the control circuit as follows: from one of the conductors of the supply circuit 33 to the lefthand terminal 25, jaw 26, switch blade 18,

member 19, bar 20, head 10, through windbroken lilies in Fig.1. As the portions 22 of the body portion of the switch move toinitially increase the distances between them and the bolts 23, the spring member 24 is expanded and has energy stored therein. As

the blade member 18 is relatively wide, the current will continue to traverse the magnet coil and the circuit until the coil reaches substantially its central position on the guide ,member 4. At this time, the magnet coil 8 and the associated switch member 18 are moving at relatively high speed and, even though the circuit is now interrupted by the disengagement of the switch blade 18 from the left-hand jaw 26, the coil and switch parts will continue their movement. As soon as the magnet coil 8 has moved beyond the middle point of the core member 5,

the energy stored in the spring 24 will cause the movement to continue until the coil 8 and the switch member 17 occupy the respective position indicated by the broken lines in Fig. 1.

The above described movement of the switch blade interrupts the supply of energy through the resistor 29, and, therefore, the thermostat 30 will soon be disengaged from the contact 31 and finally engage the contact 32. When this occurs, the circuit will again be established through the magnet coil as hereinbefore described, and the coil will move from its left-hand. position, indicated by the broken lines in Fig. 1, to its righthandposition indicated by the full lines in Fig. 1.

It may be noted that the thermostat circuit is not interrupted by the movement of the member 30 but is interrupted by the dis en agement of the blade 18 from the jaws 26, thus insuring that there shall be substantially no pitting of the thermostat contacts. I

The device embodying my invention thus provides a single reciprocally movable coil to actuate a switch member to close and interrupt a circuit through a resistor. It may be noted that the entire assembly of the switch may be made relatively compact and that there are but few moving parts, which may be made relatively rugged and adapted to be operated a large number of times without causing any appreciable wear in the cooperating parts. Even if these .parts wear,

Inn

the device will operate substantially as when new, to close and interrupt an electric circuit.

Various modifications may be made in the device embodying my invention without departing from the spirit and scope thereof and I desire that only such limitations shall be placed thereon as are limited by the prior art or are specifically set forth in the appended claims.

. I claim as my invention:

1. In a switch, the combination with a movable blade, a plurality of stationary jaws, a reciprocally slidable magnet coil, resilient means for operatively connecting said movable blade to said magnet coil, of means for causing said coil, upon the energization thereof, to selectively engage said stationary jaws, said means comprising a core member adapted to have said coil slide thereon, said core member having a central magnetic portion and two non-magnetic end portions, and said resilient means being adapted to normally maintain said coil at one of said non-magnetic end portions and to cause said coil when energized to move past said magnetic portion.

2. In a switch, he combination with a plurality of stationary jaws and a movable blade adapted to selectively engage said jaws, of means for actuating said blade to selectively engage said jaws comprising an elongated guide and core member, said guide,

member having a central magnetic portion and two non-magnetic end portions, a magnet coil reciprocally slidable on said guide for actuating said blade, and a spring member operatively engaging said coil and blade for normally. maintaining said coil at one of said non-magnetic end portions and adapted to cause said coil when energized to move past said magnetic portion.

3. In a switch, the combination with a plurality of stationary jaws and a movable blade adapted to selectively engage said jaws, of an elongated guide and core member comprising a central magnetic portion and two non-magnetic end portions, and a magnet coil reciprocally slidable on said guidefor actuating said blade.

4. In a switch, the combination with a plurality of stationar jaws and a movable blade adapted to se ectively engage said aws, said blade, an elongated guide and core member for said magnet coil comprising an intermediate magnetic portion and two nonmagnetic end portions, said coil being adapted when energized to move on said guide from one end thereof to substantially its middle portion, and an energy-storing means associated with said coil and blade and adapted to store energy during the movement of said coil and to cause said coil to move past said magnetic portion to the other end of said guide, whereby said blade is disengaged from one of said jaws and interrupts the circuit through said coil.

5. In a switch, the combination with a movable blade and a plurality of stationary jaws, of means for causing said blade to selectively engage said jaws, said means comprising a centrally located magnetic core and guide member having nonmagnetic end portions, a single magnet coil operatively engaging said movable blade and movable to a substantially central position on said guide -1nember when energized, and means associated with said coil and blade for storing energy during sa.i d movement, said energ ystoring means causing a continuation of tee movement of said coil and blade 6. In a switch, the combination wish movable blade and a plurality of siatienatxy jaws adapted to be selectively en aged said blade, of means comprising a movable magnet coil and a composite lde and core member for disengaging said from one of said aws, said composite and core member having a. central magnetic portion andtwohon-magnetic end portions.

7. In a switch, the combination with a movable blade and a plurality of stationary jaws adapted to be selectively engaged by said blade, of means comprising a single movable magnet 0011, a composlte guide and core member, having a central magnetic of a magnet coil adapted to actuate portion and two nonmagnetic end portions,

and an energy-storing means for causing said switch blade to move past said magneti'c portion and to selectively and alternate- 1y engage said switch jaws.

In testimony whereof, I have hereunto subscribed my name this 15th day of March,

FRANK F. ronsnnnv 

